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Optically Pumped Far-infrared Laser Lines Of Methanol Isotopomers: 12cd3oh, 12ch3od, And 12ch2doh
No full textTwenty-seven new FIR, far-infrared, laser lines from the isotopomers of methanol: 12CD3OH, 12CH3OD, and 12CH2DOH, were obtained by optically pumping the molecules with an efficient cw CO2 laser. The CO2 laser provided pumping from regular, sequence, and hot-band CO2 laser transitions. The 2 m long far-infrared cavity was a metal-dielectric waveguide closed by two, flat end mirrors. Several short-wavelength (below 100 μm) lines were observed. The frequencies of 28 laser lines observed in this cavity (including new lines and already known lines) were measured with a fractional uncertainty limited by the fractional resetability of the far-infrared laser cavity, of 2 parts in 107.214477483Zerbetto, S.C., Vasconcellos, E.C.C., Far-infrared laser lines produced by methanol and its isotopic species: A review (1994) Int. J. IR and MM Waves, 15, pp. 889-993Pereira, D., Moraes, J.C.S., Telles, E.M., Scalabrin, A., Strumia, F., Moretti, A., Carelli, G., Massa, C.A., A review of optically pumped farinfrared laser lines from methanol isotopes (1994) Int. J. IR and MM Waves, 15, pp. 1-44Inguscio, M., Strumia, F., Evenson, K.M., Jennings, D.A., Scalabrin, A., Stein, S.R., Far-infrared CH3F Stark Laser (1979) Opt. Lett., 4, pp. 9-11Petersen, F.R., Evenson, K.M., Jennings, D.A., Wells, J.S., Goto, K., Jimenez, J.J., Far-infrared Frequency Synthesis with Stabilized CO2 Lasers: Accurate Measurements of the Water Vapor and Methyl Alcohol Laser Frequencies (1975) IEEE J. Quantum Electronics QE-11, pp. 838-84
Optically-pumped Far-infrared Laser Lines Of Methanol Isotopomers: 12ch3oh, 12ch3od, And 12ch2doh
No full textTwenty-seven new far-infrared laser lines from the isotopomers of methanol: 12CD3OH, 12CH3OD, and 12CH2DOH, were obtained by optically-pumping the molecules with an efficient cw CO2 laser. The CO2 laser provided pumping from regular, sequence, and hot-band CO2 laser transitions. The 2-m long far-infrared cavity was a metal-dielectric waveguide closed by two, flat end mirrors. Several short-wavelength (below 100 μm) lines were observed. The frequencies of 28 laser lines observed in this cavity (including new lines and already known lines) were measured with a fractional uncertainty limited by the fractional resetability of the far-infrared laser cavity, of 2 parts in 107.215731738Zerbetto, S.C., Vasconcellos, E.C.C., Far-Infrared laser lines produced by methanol and its isotopic species: A review (1994) Int. J. IR and MM Waves, 15, pp. 889-993Pereira, D., Moraes, J.C.S., Telles, E.M., Scalabrin, A., Strumia, F., Moretti, A., Carelli, G., Massa, C.A., A review of optically pumped far-infrared laser lines from methanol isotopes (1994) Int. J. IR and MM Waves, 15, pp. 1-44Inguscio, M., Strumia, F., Evenson, K.M., Jennings, D.A., Scalabrin, A., Stein, S.R., Far-Infrared CH3F Stark Laser (1979) Opt. Lett., 4, pp. 9-11Petersen, F.R., Evenson, K.M., Jennings, D.A., Wells, J.S., Goto, K., Jimenez, J.J., Far-Infrared Frequency Synthesis with Stabilized CO2 Lasers: Accurate Measurements of the Water Vapor and Methyl Alcohol Laser Frequencies (1975) IEEE J. Quantum Electronics, QE-11, pp. 838-84
12ch2f2 And 13ch2f2far-infrared Lasers: New Lines And Frequency Measurements
No full textWe report here the discovery of 13 new far-infrared laser lines from 12CH2F2 and seven new lines from 13CH2F2. Most of the new lines were pumped by high-J lines of the 9R branch of a cw-CO2 laser. Wavelengths range from 97.6 to 616.18 μm. Frequency, pump offset, relative polarization, and relative intensity were measured for most of the new lines.181223012306Douglas, N.G., Millimeter and Submillimeter Wavelength Lasers (1989) Springer Series in Optical Sciences, , Springer-VerlagDeroche, J.C., Benichou, E.K., Guelachvili, G., Assignments of submillimeter emissions in difluoromethane pumped by 12C16O2 and 12C18O2 lasers (1986) Int. J. IR & MM Waves, 7, pp. 1653-1675Suzuki, I., Shimanouchi, T., Vibration-rotation spectra and molecular force field of methylene fluoride and methylene fluoride - d2 (1973) J. Mol. Spectrosc., 46, pp. 130-145Scalabrin, A., Tomaselli, J., Pereira, D., Vasconcellos, E.C.C., Evenson, K.M., Petersen, F.R., Jennings, D.A., (1986) Int. J. of IR & MM Waves, 6 (10), pp. 973-979Evenson, K.M., Chou, C.C., Bach, B.W., Bach, K.G., New CW CO2 laser lines: The 9 μm hot band (1994) IEEE J. Quantum Electron., QE-30, pp. 1187-1188Inguscio, M., Strumia, F., Evenson, K.M., Jennings, D.A., Scalabrin, A., Stein, S.R., Far-infrared CH3F laser (1979) Opt. Lett., 4, pp. 9-11Adam, B., Kneubuhl, F., Transversely excited 337 μm HCN waveguide laser (1975) Appl. Phys., 8, p. 281Petersen, F.R., Evenson, K.M., Jennings, D.A., Wells, J.S., Goto, K., Jimenez, J.J., Far-infrared frequency synthesis with stabilized CO2 lasers: Accurate measurements of the water vapor and methyl alcohol laser frequencies (1975) IEEE J. Quantum Electron., QE-11, pp. 838-84
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Far Infrared Laser Lines Produced By Methanol And Its Isotopic Species: A Review
No full textMethanol (CH3OH) is considered today one of the most important active media for the generation of laser radiation in the far-infrared (FIR) spectral region. Together with ten of its other isotopic species, it is responsible for the major part of the laser lines generated by the optical pumping technique. Due to the extreme importance of those molecules as laser generators, we understood that there was a necessity of a comprehensive work which would include as much pratical information as possible about each line. Chang et al(1) early recognized methanol as a source of strong FIR laser lines. Since then, more than 100 papers were published containing information about new laser emission. Recently, Moruzzi et al(114) presented a review of 575 lines produced by12CH3OH. In the present paper, we have extended the review to the various isotopic modifications of this molecule (namely13CH3OH, CD3OH,13CD3OH, CD3OD,13CD3OD, CH3OD, CH318OH, CH2DOH, CH2DOD and CHD2OH), a total of nearly 2000 lines with wavelengths ranging from 19 μm to 3030 μm. © 1994 Plenum Publishing Corporation.15588993
Far Infrared Laser Lines From Ch3oh And Isotopes: A Review
No full textMethyl Alcohol is the most prolific and one of the most efficient molecules for the production of optically pumped FIR laser lines. We present a review of nearly 2000 CO2 pumped FIR laser wavelengths, and frequencies of about fifteen percent of those, measured in CH3OH and its isotopes.2104515
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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